I don't Harry will break up. He knows he needs to keep away from Ginny, because he knows Voldemort will go after her if he gets wind that she's special to Harry. What Harry will do is keep away, kill Voldemort, and then return to his lady fair, if she isn't murdered. There's even the possibilty they'll get married, though they'd have to wait a bit, with Ginny only sixteen, and not of age.